<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    
    <div id="app">
        <cpn><span slot="center">替换了</span></cpn>
    </div>

    <template id="cpn">
        <div>
            <slot name="left"><span>左边</span></slot>
            <slot name="center"><span>中间</span></slot>
            <slot name="right"><span>右边</span></slot>
        </div>
      
    </template>


    <script src="../vue.js">

    </script>

    <script>
        const app = new new Vue({
            el:'#app',
            components: {
                cpn:{
                    template:'#cpn'
                }
            }
        })
    </script>
</body>
</html>